Kinetics of the reactions of OH radicals with some oxygenated volatile organic compounds under simulated atmospheric conditions
Résumé
Some relative rate experiments have been carried out at room temperature and at atmospheric pressure. This concerns the OH-oxidation of some oxygenated volatile organic compounds including methanol (k(1)), ethanol (k(2)), MTBE (k(3)), ethyl acetate (k(4)), n-propyl acetate (k(5)), isopropyl acetate (k(6)), n-butyl acetate (k(7)), isobutyl acetate (k(8)), and t-butyl acetate (k(9)). The experiments were performed in a Teflon-film bag smog chamber. The rate constants obtained are (in cm(3) molecule(-1) s(-1)): k(1) = (0.90 +/- 0.08) x 10(-12); k(2) = (3.88 +/- 0.11) x 10(-12); k(3) = (2.98 +/- 0.06) x 10(-12); k(4) = (1.73 +/- 0.20) x 10(-12); k(5) = (3.56 +/- 0.15) x 10(-12); k(6) = (3.97 +/- 0.18) x 10(-12); k(7) = (5.78 +/- 0.15) x 10(-12); k(8) = (6.77 +/- 0.30) x 10(-12); and k(9) = (0.56 +/- 0.11) x 10(-12). The agreement between the obtained rate constants and some previously published data has allowed for most of the studied compounds to point out a coherent group of values and to suggest recommended values. Atmospheric implications are also discussed. (C) 1998 John Wiley & Sons, Inc.